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Resonant acoustic determination of complex elastic moduli

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Author
Tan, Beng Hock
Date
1991-03
Advisor
Garett, Steven L.
Brown, David A.
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Abstract
An acoustic resonance based technique using a free-free bar has been extended to investigate the complex (storage and loss) moduli of non-magnetic materials having circular cross section. Using this technique, the bar can be selectively excited in three independent vibrational modes, i.e. torsional, flexural and longitudinal modes. The torsional mode yields the shear modulus. Either the flexural or longitudinal mode can be used to obtain Young's modulus. These resonant modes can be tracked continuously by means of a phase-locked-loop (PLL) as the temperature (and resonant frequency) of the rod is changed. The in-phase amplitude of the receiver output of the electrodynamic transducer is proportional to the quality factor,Q, of the material. It can be used to continuously track the loss tangent (=1/Q) of the material as a function of temperature and frequency. Results for complex shear modulus and Young's modulus were obtained for a castable epoxy type PR1592 and complex shear modulus for polymethyl methacrylate (PMMA) and Uralite 3130. Over the temperature and frequency range that was accessible, a clear viscoelastic transition was observed in both the storage modulus and loss tangent curves of PR1592.
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URI
http://hdl.handle.net/10945/27240
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  • 1. Thesis and Dissertation Collection, all items

Related items

Showing items related by title, author, creator and subject.

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    Resonant Acoustic Determination of Complex Elastic Moduli 

    Brown, David A.; Garrett, Steven L. (1991-12);
    A simple, inexpensive, yet accurate method for measuring the dynamic complex modulus of elasticity is described. Using a 'free-free' bar selectively excited in three independent vibrational modes, the shear modulus is ...
  • Thumbnail

    Determination of the complex elastic moduli of materials using a "free-free" bar technique 

    Bartlett, David L. (Monterey, California. Naval Postgraduate School, 1994-03);
    The objective of this research is to investigate the dynamic elastic properties of materials and their temperature and frequency dependence using an acoustic resonance based method. In this technique, the torsional, flexural, ...
  • Thumbnail

    Investigation of the viscoelastic properties of a water-saturated sediment. 

    Hutchins, John Roy (Monterey, California. U.S. Naval Postgraduate School, 1967-06);
    Experiments were made in the laboratory to determine the feasibility of adapting to the measurement of the shear elastic properties of sediment- like materials techniques already proven for use on viscoelastic liquids. ...
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